WSP09583

• File Number: 8210.470
• Description: Pacific Southwest Interagency Committee
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 6/1/1971
• Author: PSIAC
• Title: Lower Colorado Region - Comprehensive Framework Study of Water and Land Resources - Summary Report - June 1971
• Water Supply Pro - Doc Type: Report/Study

uJ2171

S1lIIUllary of Water Requirements and Supply (Continued)

Total Annual Demand
1965 1geo 2000 2020

Water Supply with Augmentation
(Unit: Million Acre-Feet)

Colorado River Available for Use
in LbWei Colorado Region

2.63

1.33

0.90

2.25

National Obligation to
Mexican Water Treaty ~

1. 80 -y 1. 80 "l!
3.12 3.12 3.12
5.37 6.25 5.82
6.88 7.26 8.52
1.51 1.01 2.70
0.03 0.57 2.53
1.48 0.44 0.17

Local Water Supply

3.12

Total Supply Available for Use
in Lower Colorado Region g;

Lower Colorado Region Depletion
Requireme'nts

5.75

5.83
0.08

Regional Water Deficiency -y

Regional Augmentation 21
Remaining Deficiency ~

0.08

1I Excludes mainstream Colorado River reservoir evaporation accounted
for in the determination of availability of Colorado River water.

gj Excluding ground-water overdraft.

-y Lack of facilities prevented utilization of the Region's full share
of Colorado River water resulting in a ground-water overdraft of about
2.5 million acre-feet. In the future to limit the water supply defi-
ciency to that tabulated would require: distribution of the available
supply to areas of shortage, total utilization of the resource
including recycling, and that no allowance be made for transporting
salts from the Region.

~ Consists of 1.5 million acre-feet per annum for delivery to Mexico
plus an estimated 0.3 million acre-feet associated losses. In
accordance with Public Law 90-537, Section 202, "The Congress declares
that the satisfaction of the requirements of the Mexican Water Treaty
from the Co~orado River constitutes a national obligation which shall
be the first obligation of any water augmentation project planned
pursuant to Section 201 of this Act and authorized by Congress."

21 As recommended in the Lower Colorado Region framework program.

~ To be supplied by ground-water overdraft.
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